JPS58144064A - Irregular untwining preventive method for ends of a spun thread to be spliced - Google Patents

Abstract

PURPOSE:To prevent remaining of slabs or neps at thread ends after twining and eliminate beard-looking projections when splicing is completed, by cutting the thread ends ready with untwining at certain specified positions for the purpose of having the ending lengths in line. CONSTITUTION:When a thread end YP on the package side is spliced with a one YB on the bobbin side, first the thread ends YP, YB ar threaded through a splicing hole 4 provided in a splicing member 2, and then cutting devices 16, 17 shall carry out cutting of the threads, in which the cut ends are sucked into control nozzles 12, 13 by vaccum force. Then untwining is performed by compressed fluid which is injected out of a jet hole 63 upon being fed through an air conduit 64. When a thread guide lever 32 is advanced and the thread ends YP, YB are drawn out of their respective nozzles 12, 13, thread cutting devices for prevention of irregular untwining 56, 57 are put in operation to cut off the tips of the thread ends YB, YP in line. Thereafter the thread ends YP, YB are spliced in a splicing hole 4 with the aid of the jetting cmpressed fluid out of a jet nozzle 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing abnormal untwisting of yarn ends during splicing of spun yarns.

The presence of nep etc. inhibits good untwisting and prevents the formation of whisker-like protrusions at the spliced part after yarn splicing, and
In order to remove the remaining fibers at the tips of the yarn ends, which would normally be blown away by the jet stream, both ends of the yarn that have finished untwisting are cut off at a certain position to make the lengths of the yarn ends the same. It is characterized by:

As a spun yarn splicing method, a method is known in which both ends of the yarn are untwisted using an air flow, the two yarn ends are overlapped, and the yarn splicing is performed by applying an air flow. In such a pneumatic piecing method, a constant untwisted state of the yarn ends must be obtained at all times. However, in spun yarn, there are slabs and neps, and the condition of the fibers cannot necessarily be said to be uniform. Fibers that should normally be blown away by the air flow may remain, resulting in a poor untwisted state. In such a case, if splicing is performed, whisker-like portions will appear at the seam, causing undesirable situations such as protrusion. In the present invention, by operating a cutting device at a fixed position of the yarn end after untwisting the yarn end, the shape of the yarn is not damaged during good untwisting, and any remaining fibers are removed. It is.

Next, embodiments of the present invention will be described along with an apparatus for carrying out the method of the present invention.

Figure 1 is a front view of the pneumatic splicing device 1.
shall be attached to the automatic winder. There is a splicing member 2 in the center, and the splicing member 2 has a splicing hole 4 following an open slit 3 provided at the front as shown in FIG. A spout splicing is performed. 6 is a conduit connected to a pressure air source (not shown). The thread splicing member 2 is screwed onto a bracket 7 with a screw 8, and the bracket 7 is connected to thread guides 8, 9°, 10.
It has 11. The bracket 7 is also provided with control nozzles 12, 13 for untwisting the yarn ends. There are thread presser levers 14 sandwiching both sides of the thread splicing member 2 to help the thread enter the thread splicing hole 4. The thread presser lever 14 is pivoted by pulling a rod 16 provided at its base. 1
6.17 is a thread cutting device consisting of a fixed blade and a movable blade, and is operated by a lever 18 connected to the movable blade. On both sides of it,
There is a fork guide 21 with guide grooves 19.20 and a fork guide 24 with guide grooves 22.23.

Above the fork guide 21 is a swing lever 26. Package side yarn end clamp device 27 consisting of clamp plate 26
There is a lever 28. below the fork guide 24. Bobbin side yarn end clamping device 30 consisting of a movable clamp plate 29
There is.

On the right side of the yarn splicing member 2, there are a pair of yarn shifting levers 32, 32 pivotally supported on a support shaft 31. 33 is thread shifting lever 3
This is the second stopper. Bobbin side thread end clamp device 30
There is a detection device 35 attached to the fixed guide plate 34 at the bottom, which not only checks the threads to be spliced, but also checks the threads during normal winding. A pair of switching levers 37 and 37 are provided which are pivotally supported on the pivot shaft 36 so as to sandwich both the fixed guide plate 34 and the detection device 36. The switching lever 37.37 has a guide groove 39 that coincides with the thread path 38 of the detection device 36 and a relief groove following it.

A hook portion 41 is provided.

The state when the bracket 7 is removed is shown in FIGS. 4 and 5. The block 60 has a groove 61 on its front surface, in which a cutter operating lever 62 is supported by a shaft 63. Forked portions 54 at both ends of the cutter operating lever 62
, 65 is inserted with the bin 60.61 installed in the movable blade 58.59 of the yarn cutting device 56.57 for preventing abnormal untwisting, and the yarn cutting device for preventing abnormal untwisting is activated by the reciprocating rotation of the cutter operating lever 62. 56.87 movable blade 58.59 is opened and closed. The tip of said blade 58,59 is located above the opening of the control nozzle 12,13.

Since the control nozzles 12, 13 are of the same shape, only one control nozzle 12 will be described. In FIG. 5, 60 is a nozzle hole bored in the block 6o.
A tubular nozzle vibro 1 slidable in the axial direction is fitted therein. The nozzle vibro 1 is connected to a flexible pipe 62 connected to a suction pipe (not shown).

Near the opening end of the nozzle vibro 1, an injection hole 63 facing toward the back of the nozzle vibro 1 is provided obliquely. The injection hole 63 is connected to a pressure conduit (not shown) via an air guide hole 64 provided in the block 6o.

Next, the yarn splicing method of the present invention will be explained.

When the detection device 36, which detects the breakage of the thread during winding or the disappearance of the thread layer on the bobbin, detects that the thread is not running, the winding is stopped and the thread splicing operation is performed. A pair of package-side suction arm 44 and bobbin-side suction arm 43 suck and rotate the package-side yarn end YP and bobbin-side yarn end YB, respectively, and introduce the yarn ends into the yarn splicing device 1. The above pair of suction arms 4
The rotations of 4°43 are not performed at the same time, and first the package side yarn end YP is turned to the package side suction arm 44.
The yarn end YB on the bobbin side is sucked by the yarn splicing device 1, rotates to a position outside the yarn splicing device 1, and stops, and after a predetermined period of time has elapsed,
It is sucked by the bobbin-side suction arm 43, rotates to a position outside the yarn splicing device 1, and stops. After the package-side suction arm 44 is activated and before the bobbin-side suction arm 43 starts to operate, the swing lever 26 of the package-side thread clamp device 27 is activated to turn the thread YP, as shown in FIGS. 3 and 4. Lever 26 and clamp plate 2
6, the thread YP is introduced into the fixed guide plate 34 installed near the detection device 36 and the guide groove 39 of the switching lever 37, and after being checked by the detection device 36, the switching lever 37 is The thread YP is rotated about the pivot shaft 36 as a fulcrum to the solid line position in FIG. 4, and the thread YP is removed from the detection device 36 and inserted into the relief groove 4o. Then, the bobbin side suction arm 43 sucks the bobbin side yarn YB, pivots to a position outside the yarn splicing device 1, and stops.

This time series YB is the hook portion 41 of the switching lever 37.
．． It is guided between the lever 28 and the clamp plate 29 of the bobbin side clamping device 30 through the .

The bobbin side and package side suction arms 43.
When the operation of 44 is completed, the thread shifting levers 32 and 32 are rotated about the support shaft 31 to move the bobbin side thread Y as shown in FIG.
B into the guide groove 19 of the fork guide 21. Thread splicing member 2
Thread splicing hole 4. The package side yarn YP is guided into the groove between the yarn guides 10. Groove between yarn guides 8°9, yarn splicing hole 4 of yarn splicing member 2. and guide to the guide groove 23 of the fork guide 24. Thereafter, the turning lever 26 of the package side clamp device 27 comes into pressure contact with the clamp plate 26, and the package side yarn YP is clamped.
The clamp plate 29 of the bobbin side clamp device 3° is connected to the lever 2.
8, and the bobbin side thread YB is clamped (Fig. 7).

Next, by pulling the lever 18 of the thread cutting device 16, 17, the thread cutting device is operated at a predetermined position by the bobbin side clamp device 3o and the package side clamp device 27, and the thread is cut.

The control nozzle 12.13 is operated in parallel with the yarn cutting, and its suction action draws the cut yarn end into the control nozzle 12.13, as shown in FIG.

Thereafter, the thread shifting lever 32.32 is moved back and the thread end is sucked further into the control nozzle 12.13. The control nozzle 12 produces a suction effect by the suction effect of the flexible piston 62 connected to the nozzle vibro 1. At the same time, through the air guide hole 64 provided in the block 6°,
Compressed fluid is ejected into the nozzle vibro 1 from the injection hole 63 drilled in the nozzle vibro 1, and the nozzle vibro 1
The inner thread ends are untwisted and loosened.

Here, since the nozzle vibro 1 is inserted in the nozzle hole 60 so that it can move forward and backward, the injection hole 63
The direction of the compressed fluid jetting out changes. Then, the position where the ejected compressed fluid hits the yarn end changes, and the untwisted length and degree of untwisting of the yarn end changes. When the nozzle vibro 1 is pulled out and inserted, the ejected fluid hits a relatively upper portion of the yarn end, and as a result, the untwisted length becomes longer and the tip becomes thinner like a whisker. If you join the threads in this condition, the seams will be unsightly and pilling will easily occur. Further, when the nozzle vibro 1 is pushed deeply, the ejected fluid hits the tip of the yarn end, which shortens the untwisted length and weakens or thickens the seam. Therefore, the front and rear positions of the nozzle vibro 1 are adjusted depending on the yarn type and yarn count to obtain a good untwisted state.

Now, the control nozzles 12.13 control the yarn ends YB and Y.
When P is untwisted to a state suitable for splicing and the suction action of the control nozzle 12.13 is stopped, the thread shifting lever 32 is moved forward again as shown in FIG. Then, the yarn ends YP and YB are pulled out from the control nozzle 12.13, and if there is a yarn end portion longer than a predetermined length, that end portion is left in the control nozzle 12.13.

At this time, when the cutter operating bar 62 is swung within the groove 61 of the block 6o by rotating the shaft 63, the prongs 54 of the cutter operating lever 62 are rotated. .

Movable blade 58 via pins 61 and 62 fitted in
．． 59 is activated to cut off the tips of the yarn ends YB and YP whose tips are sucked into the control nozzles 12 and 13. The cut tip is suctioned and removed by the flexible valve vibrator 62. By cutting off the tip of the yarn end, the yarn end becomes a fiber that is attached to the tip and is not untwisted.

Neps, slabs, etc. are removed.

The yarn ends YB and YP, whose tips have been cut off, are pulled out from the control nozzle 12.13 by the operation of the yarn presser lever 14.
This means that they are aligned in the splicing hole 4.

At this time, the stopper 46 can be adjusted in its front and rear positions,
By changing the position of the net tube 46, the control nozzle 12
．． The amount by which the yarn ends YB and YP are pulled out from 13 can be changed, so that the length of the overlapping portion of both yarn ends YB and YP can be changed (FIGS. 9 and 10).

Next, the compressed fluid is ejected from the ejection/slip 5, and both yarns YB and
When YP is reached, both yarns are in contact and overlapped, resulting in initial entanglement between the fibers at the contact area. As a result of this entanglement, both yarns YB and YP become one body, and while moving within the splicing hole 5 due to the jet flow, entanglement between the fibers is further promoted.

When the thread splicing is completed, the package side and bobby>m clamp devices 27 and 30 release the now integrated threads YB and YP, the thread presser lever 14° and the thread shifting lever 32 move back, and the thread is spliced. It is released from the device 1 and returns to the normal winding position, and winding is resumed.

As described above, according to the present invention, in order to cut off the tip at a predetermined position when the tip is drawn out in the control nozzle, the nep or slab at the tip of the raw yarn end, or even the long fiber like the tip of a brush, is cut off at a predetermined position. etc., and the fibers are completely entangled within the splicing hole of the splicing member.
In addition, it is possible to eliminate the formation of protruding fibers at the yarn joint.

[Brief explanation of drawings]

Figure 1 is a front view of the yarn splicing device and detection device, Figure 2 is a front view of the yarn splicing device, Figure 3 is a plan view, Figure 4 is a partially cutaway plan view, and Figure 5 is the yarn splicing device. FIG. 6 is a front view of the yarn splicing device with the bracket removed, and FIGS. 7 to 10 are cross-sectional views of the control nozzle portion. YB... bobbin side yarn end, YP... package side yarn end, 12.13... control nozzle, 56.57... yarn cutting device for preventing abnormal untwisting. Haku 3 Prisoner No. 7 Atsushi No. 8 No. 9

Claims (1)

[Claims] An air stream is applied to the spun yarn to untwist the yarn end, loosen the fibers at both yarn ends, overlap both yarn ends, and then apply an air flow to the overlapping yarn ends to mix the fibers at both yarn ends. A yarn end for spun yarn splicing, characterized in that when spun yarn is spliced, a certain position of each untwisted yarn end is cut off to make the length of the yarn ends uniform before the yarn ends are overlapped. A method for preventing abnormal untwisting.